var browser  = navigator.userAgent;

var firefox = (browser.indexOf("Firefox") != -1);
var chrome = (browser.indexOf("Chrome") != -1);
var safari = (browser.indexOf("Safari") != -1);
var opera = (browser.indexOf("Opera") != -1);
var msie = (browser.indexOf("MSIE") != -1);

include1 = '<link href="';
include2 = '" type="text/css" rel="stylesheet">';

if(firefox){
	cssfile = '/css/menu.css';
}
else if(chrome && safari){
	cssfile = '/css/menu_chrome.css';
}
else if(chrome && !safari){
	cssfile = '/css/menu_chrome.css';
}
else if(safari && !chrome){
	cssfile = '/css/menu_safari.css';
}
else if(opera){
	cssfile = '/css/menu_opera.css';
}
else if(msie){
	cssfile = '/css/menu.css';
}
else {
	cssfile = '/css/menu.css';
}

document.write(include1 + cssfile + include2);